USE WITH 1" TO 1 3/4" DOORS WEIGHING UP TO 150LBS EACHThis hardware set features out top-of-the-line ball bearing hangers. The adjustable 2-wheel ball-bearing hanger is used for doors up to 100lbs. and our 4-wheel ball-bearing hanger is used for doors up to 150lbs. Our ball-bearing hangers operate smoother and more effortless than any in their class. This hardware is used in conjunction with our aluminum 800 track or our aluminum 1200 split-header track that allows for the track to be recessed directly into the header.